What do you do when your elderly parent is the most unhappy person you know?

My mother is finally living close to me again. I spent three hours with her every day for the last four days. She's in a new facility near me, with sunny days/better weather. She has options for so much more than where she was. She has Parkinson's. But she is so miserable, unhappy, anxious, lonely, all of the time! ALL OF THE TIME. It doesn't matter if I'm around. It doesn't matter if kind people introduce themselves to her. She's not making friends easily due to being so "Eeyore"-- I am sure. Her family doctor at home stopped being willing to change her anti-depressant medication because she kept asking for a new one. Kept questioning if they were working. They finally gave up and said no more new ones until you see a psychiatrist. Which she was on a waiting list for. I'll try to find one here. But sometimes I just want to give up. I don't see her enjoying one iota of life anymore. Everything is "too much", everything is awful. I thought being closer to me would actually improve her emotional well being. It hasn't changed it a bit...